双向拉伸聚丙烯耐热膜的制备与性能

1简介BOPP是"Biaxially Oriented Polypropylene"的简称,即双向拉伸聚丙烯薄膜。它的生产是使用双向拉伸设备进行,首先将原料投入挤出机并经冷却形成厚片,厚片进入双向拉伸设备后在加热的状态下按照一定的拉伸倍率进行同步或异步在相互垂直的纵横两个方向进行拉伸。拉伸过程结束后还会进行适当的后处理,如打电晕、涂布等。BOPP薄膜因其无色、无味、无毒。

Photolytic Model of Six Degradable Mulch Plastic Films

[Objective] This study aimed to solve the mulch plastic film pollution problems in Xinjiang, in order to provide reliable theoretical basis for the research on the degradation mechanism of biodegradable plastic films. [Method] The effect of illumination intensity on the decomposition of decomposable mulching films was investigated through simulating the field condition in laboratory. Regression analysis was employed to fit the processes of film decompositions. [Result] The weight loss ratios of different types of plastic films were closely related with the illumination. There was no sundry produced during the degradation process, but the weight was reduced, indicating that degradation produced gas, thus, ultraviolet rays had destructive effect on mulch plastic films. Different types of plastic films showed significant differences in the degradation speeds, and under the same conditions, the degradation speed of S4# with the induction period of 30 d was the fastest. With the extension of uv illumination time, the degradation became cumulative degradation process. [Conclusion] Under the uv rays, the weight loss ratio and illumination hours is regarded as a positive correlation relationship. The significant inspection shows that the data fitted degradation model can be described by the logistic model of Y = a/（1＋b×e -ct）, and all the parameters show significant differences （P0.01）.

A Novel Radiation Tolerant SOI Isolation Structure

A novel radiation tolerant SOI isolation structure,consisting of thin SiO2/polysilicon/field SiO2 multilayers,is proposed. A device with this structure does not show obvious changes in subthreshold characteristics and leakage current,indicating a superior radiation tolerance to traditional LOCOS.

Influence of a New Nano-PE-film on the Greenhouse Environmental Factors

[Objective] This study was to evaluate the impact of a new controlled release anti-drip nano-PE-film （CRANPF） on greenhouse environmental factors. [Method] CRANPF and conventional anti-drip PE film （CLAPF） were compared in terms of air temperature, light intensity and CO2 concentration by the leafy agriculture greenhouse intelligent monitoring system. [Result] Compared to CLAPF, the air temperature rose slower in CRANPF during hot weather and had better photosynthesis efficiency. [Conclusion] Compared with ODLAPF, CRANPF has better perfor- mance and more extensive application prospects.

RADIATION EFFECT ON FLUORINATED SiO_2 FILMS

A systematic investigation of γ radiation effects in gate SiO2 as a function of thefluorine ion implantation conditions was performed. It has been found that thegeneration of interface states and oxide trapped charges in fluorinated MOSFETsdepends strongly on implantation conditions. The action of F in oxides is theconjunction of positive and negative effects. A model by forming St--F bonds tosubstitute the other strained bonds which easily become charge traps under irradiationand to relax the bond stress on St / SiOZ interface is use'd for experimental explanation.

Investigation on the Morphology of Adsorbed Benzotriazole Film on Copper Surface by Scanning Tunneling Microcopy

It is observed by scanning tunneling microscopy (STM) that theadsorbed Benzotriazole (BTA) on copper is long in shape and has anirregular rectangle. The growth of BTA on copper is in the form ofpolymeric chain and mainly in one dimension rather than twodimensions. The copper surface covered by BTA becomes flatter,smoother and the roughness was smaller than that of bare copper, sothe corrosion is largely decreased. However, many grooves can be seenbetween BTA polymeric chains in which corrosion may exist to adegree.

Electrochemical water oxidation by photo-deposited cobalt-based catalyst on a nano-structured TiO_(2) electrode

A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor(TiO_(2)).Different thicknesses of the TiO 2 films as well as different time of photo-deposition of the Co-based catalyst on TiO_(2) films have been optimized.It was found that the electrode with 3 layers of TiO_(2) film(in 8 m thickness) and 1 hour photo-deposition of the cobalt-based catalyst by light irradiation from a 500 W Xenon lamp gave the highest current density(~5 mA/cm^(2)).Using this cobalt-modified TiO_(2) film as a working electrode in an electrochemical device,highly efficient water oxidation has been demonstrated in a pH 7.0 aqueous solution with low overpotential.

Photo-electrochemical water splitting system with three-layer n-type organic semiconductor film as photoanode under visible irradiation

A three-layer structure of n-type organic semiconductors （PTCDA/PTCDA：PCBM/PCBM） is successfully identified as pho- toanode for photoelectrochemical water oxidation during the overall splitting of water into hydrogen/oxygen in a nearly stoi- chiometric ratio （H2：O2 = 2：1） under visible irradiation （2 〉 420 nm）. A possible charge separation mechanism under visible light illumination was also proposed.

UV irradiation induced conductivity improvement in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) film

We describe a simple method to increase the conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)film by exposure to ultraviolet(UV)light in vacuum.Up to four order of conductivity improvement(from 10 3to 50 S/cm)is achieved by irradiating PEDOT:PSS film with 254 nm ultraviolet(UV)light.Increased conductivity in UV treated PEDOT:PSS film is stable under ambient exposure.The mechanism for conductivity improvement is investigated by current-voltage measurement,atomic force microscopy,and absorption spectrum.Photo-cross-linking of PSS chains is determined as the reason for conductivity improvement.Our result demonstrates that UV treatment is capable of modifying the conductivity of PEDOT:PSS film independent of the process of film formation.